Azo dye and process of making.



GERMANY, A CORPORATION OF GERMANY".

PAUL JULIUS, 0F LUDWIGSHAFEN-ON-THE-RHINE, AND LOUIS BLANGEY MANY, ASSIGNOBS TO BADISCHE ANILIN & SODA FABB AZO DYE AND PROCESS OF MAKING.

No Drawing.

the Swiss Republic, residing, respectively, at

Ludwigshafen-on-the-Rhine and Mannheim,

Germany, have invented new and useful linprovements in Azo Dyes and Processes of Making the Same, of which the following is a specification. i

We have discovered that by combining diazotized 2.6-dinitro-anilin with beta aphthol, a scarletred coloring matter can be obtained which is especially suitable for use in the form of its lakes, since these are fast against the action of water, alcohol, lime, and light, and are insoluble in oil and do not sublime. The combination of the diazotized 2.6-dinitro-anilin with the betanaphthol is preferably caused to take place in the presence of free mineral acid, but it can be carried out in the presence of soda, lime, acetate, or the like. Our new coloring matter possesses a scarlet-red color, is insoluble in water, difi'icultly soluble in alcohol, more easily soluble in hot xylene, and in the pure state melts at about 248 C.

The following example will serve o illustrate further the nature of our intention and how it can be carried into practical effect, bu our invention is not confined to this exan le. Diazotize eighteen and three-tenths Specification of Letters Patent. Application filed April 15, 1909. 'Serial No. $0,156.

parts by weight of 2.'6dinitro-anilin by introducing it into a solution in concentrated sulfuric acid of the requisite quantity of nitrosyl sulfate, and then allow the solution to run, while stirring, into an aqueous sus pension of iit't'eenparts by weight of betanaphthol to which ice has been adde The combination takes place in'nnediately. If desired, the combination may be carried out in the presence of soda, lime, acetate, or the like, and, if desired, a substratum, of Turkey red oil, or soap, may be added.

Now what we claim is:

l. The process of producing azo coloring matter by combining diazotized 2.6-dinitroauilin with beta-na1' hthol.

2.'.\s a new article of manufacture the azo coloring matter which can-be obtained by combining diazotized 2.6-dinitro-anilin with beta-naphthol which coloring matter possesses a scarlet-red color, is insoluble in water, ditficultly soluble in alcohol, more easily soluble in hotxylene, and in the pure state melts at about 248 C.

In testimony whereof we have hereunto set our hands in the presenceof two subscribing witnesses.

PAUL JULIUS. LOUIS BLANGEY.

itnesses:

J. ALEc. LLOYD, Jos. H. LEUTE.

Patented Aug. 24., 1909.

0F mANNHEm, GER- IE, or LUDWIGSHAFEN-ON-THE-RHINE, 

